Inorganic polymers are a novel class of materials formed by the
polymerization of silicon, aluminium and oxygen species
to form an amorphous three-dimensional framework structure.

The basis of this process is the alkaline solutions to induce a
certain amount of Si and Al atoms to dissolve from a feedstock such
as aluminosilicate

A subset of the inorganic polymers is defined as "geopolymers".
In this case, the binding phase is almost exclusively
aluminosilicate, containing tetrahedral Al and tetrahedral Si.

Inorganic-polymeric hybrids materials can be expected that its
characteristics are completely different either from that of the
organic polymer or the inorganic material, and the possibilities of
such hybrids are infinite.

Inorganic polymers based on alumina and silica polysialate units
were synthesised from dehydroxylated aluminosilicate clay
(metakaolinite) condensed with sodium silicate in a highly alkaline
environment.

Polysialates are inorganic polymers derived from
aluminosilicates. They can be synthesised at low temperature and
have useful properties such as high early compressive strength, a
Mohs hardness of 4–7, and they are stable at temperatures up to
1300–1400C.